When used on an Open Media Vault Pi 4 home media server that is mostly idle, I only have a 10 degree C temperature drop compared to a simple 3/4 " x found 3/4 " heatsink that was on top of the processor. It operates at around 52-54ยฐC (125-130ยฐF). The jig benefits from better machining as bars that fall onto components are not milled flat and the coating/paint applied to the jig also reduces thermal conductivity. Clear traces of processing can be seen on the underside. If the manufacturer reads this: Discard the paint/coating as this will only reduce the efficiency of the cooling performance and reduce the contact distance to the components. Then you have a winner for a passively cooled case.
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